HAZARDOUS (CLASSIFIED) LOCATIONS

Hazardous Location Equipment

Equipment for use in Class II locations differs significantly from equipment for Class I locations. In Class II locations, equipment is housed within the enclosure to keep the explosive dust away so that no internal explosion can take place. There is no need for heavy explosion-containing construction, or flame paths.

This difference explains why Class I, Division 1 equipment can be called explosion-proof, and Class II equipment is called dust-ignition proof. Class II equipment has a different set of requirements. Class II equipment must:

Seal out the dust

Operate below the ignition temperature of the hazardous substance

Allow for a dust blanket. A dust blanket is the build-up of dust collecting on top of the device that can cause it to run "hot" and become an ignition source.

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